Electrical contact.



W. F. TAYLOR. ELECTRICAL CONTACT. APPLICATIO'NIPILED FEBiS, 1907.

953,396, I Patented Mar.2Q,191(

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@MKWM being to obtain a contact surface of platinum,

' struction, the platinum is toning part, such UNIT A a is.

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ELECTRIC COMPANY, A QORPOEA'EION 0! HASBAGHUBETTS'.

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To all whom it may concern: Be it known that-I, WAL rnR F. Tamnga subject of the King of Great ing in Brookline, in the county of Norfo and State of Massachusetts, have invented an Improvement in Electrical Contacts, of which the following description, in connection with the accompanying drawings,is a specification, like letters on the drawings representing like parts. v H

The present invention 'relates to an electrical contact, the purpose oflthe invention at the same time employing the smallest amount 0% platinum possible, on account of the high cost of this material. Platinum is usedin electrical contact members not on ductivity, but because of its durability and capability quent insulation at the contact points; obvious, therefore, that a very small amount of platinum will answer. the urpose, and that any excess of material w ich may be utilized in fastening the platinum to the main conducting part is practically wasted.

In accordance with the invention, I- employ a'very thin piece of sheet platinum which may be flat, if a flat contact is required, orof convex shape if a point is required, and I secure this thin sheet of platinum to the main conducting member by means of a flange or a series of projections formed in or connected with the main conductin member, and airanged to overlie the edge 0 the sheet of platinum. Bythis confirmly secured in place, and the minimum amount of platinum is used, the structure, however, having all the advantages of a structure in which a portion of the platinum is utilized 'as a fasportion being superfluous so far as utility in operation is concerned.

Figurel is a longitudinal section of an electric contact piece embodying ethe invention; Fig. 2 is a to plan view of the same; Fig. 3 is a longitu inal section of a contactmember showing a modification; and Fig. t is an elevation partly in section showing a still further modification.

Referrin to Fi 1, the conducting terminal mom or a, w ich may be of any suitable conducting material such as copper, is provided at the contact point with the plati- Britain, resid havinga contact of resisting oxidation and conse-- It is Specification of Letters Eatent:

account of high con- 'rmember a by means of clampin .pose.

\ ber b) may Patented Mar. 29, 1910. 1907. Serial no. 355,79s.

num contact portion 1), said portion, in accordance with the invention, thin disk or sheet of platinum secured to the points a or the equivalent therefor. -Th1s construction is suitable in cases where the opposite cbntact member is in the form of a point, so that a fiat contact surface answers the pur- Where, however, the other' contact member is a fiat surface so that a point or projection is required, the disk of sheet platinum may be convexed or formed in the sha eofa on ,as' pro ect beyon the flat surface of the memer a. In either case the member a constitutes a metal base In the construction shown in Fig. 1, the member (I is cut or gouged to form the points a which are bent back.

overlying the edge of the platinum disk, and

in Fig. 3 I have shown the platinum holder as consisting of a tube 0 arranged to be inserted in an opening through the member a,

so as to form, as indicated, a rivet-shaped member having upturned flanges a. After the platinum member I) or b, or both, as indicated in the drawing, have'been placed in, position within the flanges 0 flanges are upset or bent over so as to overlie the edges of the platinum members and hold the same firmly in position, the flanges being substantially points a, Figs. 1 and 2.

As indicated in Fig. 4, the platinum member b (or a fiat sheet equivalent to the membe set in theend of a rod or bolt cl which is provided at the end'with a cup for the purpose, "the ledges of the cup then being bent over, as indicated at d, to hold the platinum member in place. This con struction is useful in cases where it is desirable to make the actual contact'member adjustable with relation to the main contact arm, or in any case where the contact member is to be removable.

Claim. In a contact for electric apparatus, a metal consisting of a or support for the platito admit of: the insertlon of the sheet of platinum, and sub the said indicated at b, so as to the opposite ends the equivalent of the a ii the edges of the contact piece, the tongues base, tongues stsiinped but from said metal I Iii esmnwny whereof, i m/w signed my base, and having their ends bent up, a conname 130 this specification in the presence of tact piece pr per held 0n 'f;he metal base by two subscribing Witnesses. the bent up ends of said tongues elasping @VALTER F. TAYLOR.

"Witnwses:

H. J. LIVERIHORE5 being stamped out of that; part of the metal JAs. J. Mzmmmx'.

base which is covered by the Contact piece. 

